The exchange data-feed gives us the expiry date. When there is a change, if the exchange updates it, it would show up on the platform. If not, the expiry remains the same on the platform. We do send an email and SMS notification to people holding NRML positions in the contracts where the expiry has changed a day before the change. The same users are also notified with a notification on the platform itself. However, all said and done, it is the end users’ responsibility to stay abreast of these changes. We do publish all of this information on the Zerodha Bulletin.